Casing elevator



Aug n2 1924. MM35@ G. KRELL CASING ELEVATOR Filed June 9. 1923 @gaf/y@ Patented Aug. l2, 1925i..

ratti@ KRHLLL, BIE .KANSAS CITY, MSSORI.

CASNG' ELEVATOR.

Application led June 9,

To all @07mm t may conce/rit Be it known that l, Gnoncn zen ot Germany, residing at Kansas City, in the county of Jackson and State olf Missouri, U. S. A., have invented certain new and useful improvements in Casing Elevators; and 1 do declare the following to be a full, clear, and exact description ot the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this speciiication.

This invention relates to casing elevators for wells, and the primary object ofthe invention is to provide an e'l'licientiform ot casing elevator, in which self-seating jaws are provided tor gripping the wellcasing. In my former patent, Number 1,446,568, granted February 27, 1923, 1 have disclosed a similar construction of casing elevator', in which the co-operating casing engaging jaws each consists of a single piece of metal, having half round casing engaging portions. rlhe elevator disclosed in that patent has proved to have a very high degree of efrciency, but in order to manufacture it, it is necessary to machine the halt round portions carefully, a process which on account of the shape is more than an ordinary machine operation. The present invention contemplates an elevator' having jaws which will not require such line, careful work, theretore, not involving the expense of manufacturing that is necessary in the elevator shown in my former patent. To this end, l have re-arranged the parts somewhat and have constructed each jaw of two members which are hinged together so that there will be a light play between the complementary members of each jaw, enabling the jaws to seat upon the casing evenly though they are not thoroughly machined.

rPhe novelty will be apparent by reference to the following description in connection with the accompanying drawings, in which:

Fig. 1 is a perspective view of a casing elevator, constructed in accordance with my invention; Fig. 2 is a disassociated view of two members of one jaw and the pin 'for connecting` them; Fig. 3 is a view, partly in Kimm., a citiplan and partly in section of one of the jaws; and Fig. l is a top plan view of the elevator, the support links being shown in section. Fig. 5 is a vertical sectional View 1923. erial No. 644,338.

of one orn the jaw members showing its relation to none of its supporting rocker arms. As shown in my prior patent, the elevator frame consists or' two side bars, 1 and 2, and two end members 3 and fl, which are shown as shafts. The end members are keyed to the ends of the side members by keys 5 (see Fig. t); in the metal portions of the end members 3 and t, are sleeves 6 and 7. r1`liese are also keyed to shafts 3 and il. The sleeves have outstanding lugs, 8 and 9, to which elevator supported links 10 and 11 are secured. The links 10 and 11 are loose in the lugs 8 and 9 to allow flexibility with respect to the frame, so that when the casing is being drawn or lowered into the well, provision may be made for slight misalignment between the cable blocks and the center ot the tubing. Between the sleeves 6 and 7 and the ends of the side bars 1 and 2 are inwardly and upwardly disposed rocking levers or arms, 12, 13, 14C, and 15, having rigid collars or sockets 16, 17, 13, and 19, in which are mounted the trunnions of the respective jaws and 21. The complementary jaws are constructed alike, therelore, I have shown one jaw construction in detail in Figs. 2 and 3. Each jaw consists ot two segmental members, 22 and 23, having trunnions 24: and 25 respectively, which are received in the collars 16, 17, 13, and 19. The two members of each jaw are hinged together, one member, tor example 22, is provided with two spaced, pertorate lugs, 26 and 27. rllhe other member, for example 23, is provided with one perforate lug 28, which is received between the two lugs 26 and 27, the lugs being secured by pin or pintle 29, which passes through them to form a hinge. Therefore, the two members 22 and 23 of each jaw are flexibly connected so that when they are moved into casing engaging position, there will be tour jaw members, each finding its own seat, as distinguished from two jaw members, shown in my prior patent. 1n order to allow the necessary play tor the jaw members, the trunnions 24; and do not lit tightly into the collars, it being obvious that in order to permit the jaw members to seat evenly all around the casing, only a very slight play is necessary. The jaw members are held in normal parallelism by the transverse pins 30 and 31, in substantially the same way as shown in my former patent, and so in this application, 1 do not lay any Special stress on the form of the mechanism, aside from the jaws, and in this Construction as well as in the Construction shown in my former patent, jaw opening linkage, 32, may be provided. y The side bars l and 2 are held on the shaft by the end plates 33, 34C, 35, and 36.

I/Vhat I claim and desire to secure by Letters Patent is: Y

l. In a easing elevator, a frame, rook shafts, rocker arms Carried by the frame, vand casing engaging jaws vcarried bythe roe-ker, each jaw consisting of two members, flravienfg a hinged connection.

2. In a easing elevator, a frame, inwardl)v and upwardly projecting rocher arms earried by the frame, and easing engaging jaws trunnioned in the rocker arm, each jaw eomprising two segmental members, and means for hinging the two members together.

3. In a casing elevator, a frame, rocker Aarms carried by the frame, and seglllental 

